He F, et al. - Researchers ascertained if the patellar height influences knee function following proximal tibia endoprosthetic reconstruction (EPR). An independent factor contributing to knee function after proximal tibia EPR was patellar height. Following tumor resection, a key point in proximal tibia EPR was the quality of patellar tendon reconstruction. Postoperative Insall–Salvati ratio (ISR) was significantly associated with extensor lag; as seen in Pearson's correlation analysis. No impact of the change in patellar height on the active flexion of the knee was seen.